◎ 留念 liúniàn(1) [accept or keep as a souvenir;taken as a memento]∶留做纪念照相留念(2) [recall with nostalgia]∶留恋;怀念-----------------国语辞典：留做纪念。如：「这次毕业旅行，大家在旅馆前合影留念。」英语 to keep as a souvenir, to recall fondly德语 Relikt (S), Reliquie (S), etw. zum Andenken schenken 法语 garder en souvenir
◎ 留存 liúcún(1) [preserve;keep]∶保存(2) [keep on file]∶存放此稿留存(3) [remain;be extant]∶存在;未消失-----------------国语辞典：保存、保留。如：「他仍留存著童年时收藏的书签。」近保存反淘汰,淹没英语 to keep, to preserve, extant, to remain (from the past)德语 Verbleib (S), zurücklegen (V)法语 garder, conserver
◎ 留中 liúzhōng(1) [Emperor leave the memorial of the official in his palace without writting directive] 皇帝把臣下的奏章留在宫禁中,不交议也不批答 留中者数月。——清· 张廷玉《明史》(2) 又仍留中。